Create fs.img <uname -r> == linux-6.1.11

mkinitramfs -k linux-6.1.11 -o fs.img

Run qemu with the compiled linux kernel

qemu-system-x86_64 -kernel ~/linux-6.1.11/arch/x86_64/boot/bzImage -initrd initrd.img

Here are the steps to create a ramfs.img file in WSL (Windows Subsystem for Linux) to run the Linux kernel in QEMU (Quick EMUlator):

Install QEMU in WSL:

sudo apt-get update
sudo apt-get install qemu-system-x86 qemu-utils

Create a directory for the ramfs image:

mkdir ~/ramfs

Populate the directory with the files you want to include in the ramfs image:

cd ~/ramfs

Create any necessary directories

mkdir -p bin etc dev lib proc sys tmp

Copy files to the directories as needed

##Create the ramfs.img file:

cd ~
dd if=/dev/zero of=ramfs.img bs=1M count=64
mkfs.ext2 ramfs.img

Mount the ramfs.img file to the ramfs directory:

sudo mount -o loop ramfs.img ~/ramfs

Copy the contents of the ramfs directory to the ramfs.img file:

sudo cp -r ~/ramfs/* /mnt

Unmount the ramfs.img file:

sudo umount ~/ramfs

Run the Linux kernel in QEMU with the ramfs.img file as the root file system:

qemu-system-x86_64 -kernel /path/to/linux-kernel -initrd ramfs.img -append "root=/dev/ram rw"

Create a virtual disk image: You can create a virtual disk image using the qemu-img command, for example:

qemu-img create -f qcow2 rootfs.img 2G

 QEMU command to specify the virtual disk image created in step 1 as the virtual hard disk of the virtual machine, for example:

qemu-system-x86_64 -hda rootfs.img -cdrom /path/to/os-installation-image.iso

In this command, the -cdrom option is used to specify the ISO image of the operating system installation image.

Perform the operating system installation: Once the virtual machine is running, you can perform the operating system installation in the usual way, using the ISO image as the installation source.

Boot the virtual machine using the virtual disk image: After the installation is complete, you can shut down the virtual machine and then boot it again using the 

virtual disk image as the root file system, for example:

qemu-system-x86_64 -hda rootfs.img